JPH11190368A - Spring clutch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate the positional adjustment of a stopper in a spring clutch used for controlling the operation and stop of a device or a mechanism. SOLUTION: A first engaging part 22 of a coil spring 20 is engaged in an engaging groove 31 in a ring member 30 which can be rotated, relative to a stopper 51 in a stop collar member 50, without directly being engaged with the latter. Further, an elongated hole 53 is formed in the stopper 51 so as to fix the ring member 30 and the stop collar member 50 together by means of a screw or a pin 70 while the position or phase of the stopper 51 is adjusted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a spring clutch for controlling a device or a mechanism which repeatedly rotates and stops, such as a paper feed roller in a copying machine.

[0002]

2. Description of the Related Art FIG. 4 shows a conventional spring clutch described in, for example, Japanese Patent Application Laid-Open No. 5-157128. The conventional spring clutch includes a coil spring 2, a shaft (output shaft) 3,
It comprises a hub 4, a ring member 5, a stop collar member 6, a timing pulley (input shaft) 7, and the like.

[0003] The tip 2a of the coil spring 2 is bent in the axial direction, and the rear end 2b is bent in the radial direction. Approximately half of the wound portion of the coil spring 2 on the front end side is fitted on the large diameter portion 3 b of the shaft 3, and approximately half on the rear end side is fitted on the outer peripheral portion of the hub 4.

The shaft 3 is formed with a small diameter portion 3a, a large diameter portion 3b and a cylindrical portion 3c in this order in the axial direction. The outer diameter of the large-diameter portion 3b is set to be slightly larger than the inner diameter of the coil spring 2, and both are configured not to idle when the coil spring 2 is fitted. In the cylindrical portion 3c,
An idling control hole 3f having a substantially D-shaped cross section is provided. In addition, a rotation shaft (not shown) connected to the shaft 3 is also provided with a projection having a substantially D-shaped cross section, and by connecting the two, the rotation is performed integrally without idling. It becomes possible. Also, grooves 3d and 3e are formed near both ends of the shaft 3, and
An E-ring or the like (not shown) for retaining is fitted.

The outer diameter of the hub 4 is set to be slightly larger than the inner diameter of the coil spring 2 as in the case of the large-diameter portion 3b of the shaft 3, and when the coil spring 2 is fitted, both of them are set. Is configured not to spin. Also,
An axially protruding projection 4a is formed at the tip of the hub 4 and is fitted into a hole 7d of a timing pulley 7 described later.

The ring member 5 is press-fitted into the large-diameter portion 3b of the shaft 3. A notch for engaging the tip 2a of the coil spring 2 is formed in a part of the inner circumferential cotton. 5a
Are formed.

The timing pulley 7 includes a cylindrical portion 7a on which the hub 4 is fitted, a belt receiving portion 7b on which an endless belt (not shown) is applied, and a flange 7c for preventing the belt from coming off. A hole 7d is formed in the step between the cylindrical portion 7a and the flange 7c, and when the projection 4a of the hub 4 is fitted, the hub 4 and the timing pulley 7 rotate integrally.

The stop collar member 6 includes a cylindrical portion 6a and a flange 6
b etc. The axial length of the cylindrical portion 6a is substantially equal to the axial length of the coil spring 2, and its inner diameter is larger than the outer diameter of the coil spring 2 fitted on the large diameter portion 3b of the shaft 3 and the hub 4. It is set to be slightly larger. A notch 6c for engaging the rear end 2b of the coil spring 2 is formed in the step between the cylinder 6a and the flange 6b. A protrusion-like stopper 6d for engaging a not-shown locking lever or the like is formed on the outer peripheral portion of the flange 6b.

The timing pulley 7 and the hub 4 are constantly rotated in a predetermined direction by a drive motor and a timing belt (not shown). The above-mentioned locking lever etc. is a stopper 6d
In a state where the movement of the stop collar member 6 is restricted, when the hub 4 rotates in a predetermined direction, the rotation of the coil spring 2 is restricted, so that the hub 4 is relatively rotated.
Rotate in the direction of loosening. Therefore, the timing pulley 7 and the hub 4 can continue rotating without being restricted from rotating. At this time, the shaft 3
Is not rotated because it is connected to the stop collar member 6 via the coil spring 2. Further, the rotating shaft (not shown) engaged with the shaft 3 does not rotate.

On the other hand, when the locking lever and the like are not engaged with the stopper 6d and the movement of the stop collar member 6 is not restricted, the coil spring 2 is fitted on the outer peripheral portion of the hub 4 and is tightly wound. In this state, the coil spring 2 and the stop collar member 6 rotate together with the hub 4 and the timing pulley 7. Further, the coil spring 2 includes a shaft 3
The shaft 3 rotates together with the coil spring 2 because it is tightly wound around the large diameter portion 3b. As a result, the rotating shaft (not shown) engaged with the shaft 3 also rotates.

As described above, the rotation and stop of the shaft 3 and the rotating shaft connected thereto can be controlled by whether or not the stop collar member 6 is locked.

[0012]

Generally, a spring clutch is used to control the start and stop timing and stop position of a specific device or mechanism. For example, a stopper 6d of the stop collar member 6 and a shaft 3 are used. It is necessary to strictly adjust the relative position of the idle rotation restricting hole 3f with the D-cut surface or the like. On the other hand, since there are dimensional errors in the parts, the relative positions of the front end 2a and the rear end 2b of the coil spring 2 are determined by the inner diameter of the coil spring 2 and the larger diameter 3b of the shaft 3.
And the dimensional error such as the outer diameter of the hub 4 and the like are not constant. In the above conventional example, the tip 2a of the coil spring 2
In order to absorb the relative positional error between the rear end portion 2b and the front end portion 2a of the coil spring 2, the ring member is press-fitted to the large-diameter portion 3b of the shaft 3 without directly engaging the front end portion 2a of the shaft 3. 5 is engaged with the groove 5a.

To assemble the conventional spring clutch, first, approximately half of the rear end side of the coil spring 2 is fitted on the outer peripheral surface of the hub 4 attached to the timing pulley 7, and the coil spring 2 is inserted into the notch 6c. The stop collar member 6 is covered from the tip side of the coil spring 2 so as to include the coil spring 2 while engaging the rear end 2 b of the coil spring 2. Next, the shaft 3 is inserted into the inner diameter portion of the coil spring 2 from the tip side of the coil spring 2 while adjusting the position (phase) relationship between the idling restriction hole 3f and the stopper 6d. Further, while engaging the groove 5a of the ring member 5 with the tip 2a of the coil spring 2, the shaft 3
Is press-fitted to the large diameter portion 3b. Finally, stoppers such as E-rings are engaged with the grooves 3d and 3e of the shaft 3, respectively.

However, as described above, since the outer diameter of the large diameter portion 3b of the shaft 3 is slightly larger than the inner diameter of the coil spring 2, the inner diameter of the coil spring 2 is increased inside the narrow stop collar member 6. There was a problem that it was very difficult to insert the shaft 3 and at the same time adjust the phase of the D-cut surface of the rotation restricting hole 3f of the shaft 3 and the stopper 6d of the stop collar member 6. Further, when the ring member 5 is press-fitted into the large-diameter portion 3b of the shaft 3, the relative phases of the shaft 3 and the stop collar member 6, which have been adjusted once, may be shifted, and it is necessary to readjust. Had a point.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and has as its object to provide a spring clutch which can be easily assembled and adjusted.

[0016]

In order to achieve the above object, a spring clutch according to the present invention is capable of engaging with a winding portion having a predetermined inner diameter and a predetermined number of turns in a natural state, with another member. The first projecting from both ends of the winding portion in a predetermined direction
A coil spring having an engagement portion and a second engagement portion, and a first cylindrical shape in which approximately half of a winding portion of the coil spring is fitted, and an outer diameter is larger by a predetermined dimension than a predetermined inner diameter of the winding portion. And a second tubular portion having an outer diameter larger than the first tubular portion. The input shaft is connected to a drive source, and is engaged with the first engagement portion of the coil spring. A ring member rotatably fitted to the second tubular portion, and a remaining portion of the winding portion of the coil spring fitted therein;
An output shaft having an outer diameter larger by a predetermined dimension than a predetermined inner diameter of the winding portion, and an output shaft engaged with the second engagement portion of the coil spring; In a state fitted to the cylindrical portion and the third cylindrical portion, the coil spring is fitted to the outside of the wound portion of the coil spring, has an inner diameter larger by a predetermined dimension than the outer diameter of the wound portion, and has an outer peripheral portion. And a cylindrical stop collar member fixed to a ring member so as to adjust a relative phase of the stopper with respect to the output shaft.

That is, according to the configuration of the spring clutch of the present invention, while the second engagement portion of the coil spring is engaged with the engagement groove or the like provided on the output shaft, the output side (the second Approximately half of the engagement portion) is fitted to the third cylindrical portion of the output shaft, and then
The first cylindrical portion of the input shaft can be fitted to the remaining portion of the winding portion from the input side (first engagement portion side) of the winding portion of the coil spring. At this point, the first engagement portion of the coil spring is free, and no position adjustment is necessary for the input shaft, the output shaft and the coil spring. Therefore, assembly is very easy.

Further, a ring member is fitted from the outside of the winding portion of the coil spring, fitted to the second cylindrical portion of the input shaft, and provided on the first engaging portion of the coil spring and the ring member. The stop collar member is fitted from the outside of the winding portion of the coil spring by engaging the engagement groove or the like, and the phase (or position) of the stopper is determined with respect to the positioning protrusion or mark formed on the output shaft. It is possible to adjust. Adjustment of the phase of the stopper is only required by rotating the cylindrical stop collar member with respect to its central axis, and the adjustment is very easy. Finally, the ring member and the stop collar member are fixed with screws or pins to complete the process. In particular, by fixing the ring member and the stop collar member with a screw or a pin and making the hole through which the screw or the pin on the stop collar member penetrate into an elongated hole, the possibility of the adjusted stopper being shifted is extremely low. , There is almost no need to readjust. Alternatively, a ratchet mechanism may be provided on the facing surface of the ring member and the stop collar member. In this case, although the component shapes of the ring member and the stop collar member become complicated, the joining step using screws or pins can be omitted.

Alternatively, as another assembling procedure, the input side (first side) of the winding portion of the coil spring is attached to the first cylindrical portion of the input shaft.
Approximately half of the engaging portion) is fitted, and then a ring member is fitted from outside the winding portion of the coil spring, and fitted to the second cylindrical portion of the input shaft. (1) The engaging portion is engaged with an engaging groove or the like provided in the ring member, and further, a stop collar member is fitted from outside the winding portion of the coil spring, and the second engaging portion of the coil spring is While being engaged with the output shaft, the other half of the output side (the second engagement portion side) of the winding portion is fitted to the third cylindrical portion of the output shaft, and the positioning projection formed on the output shaft Alternatively, it is also possible to adjust the phase (or position) of the stopper with respect to the mark or the like, and finally fix the ring member and the stop collar member with screws or pins. Even with this procedure, the phase adjustment of the stopper is performed at the final stage of the assembling process, and it is only necessary to rotate the cylindrical stop collar member about its central axis, and the adjustment is very easy.

A sintered oil-impregnated hub (having a hollow portion of a sintered alloy molded into a hub shape impregnated with lubricating oil) is provided in the first cylindrical portion of the input shaft and the second cylindrical portion of the output shaft. When the stop collar member is locked and the input shaft idles by fitting, the lubricating oil impregnated expands due to frictional heat between the coil spring and the surface of the hub, and lubricates the hub surface. As a result, wear of the coil spring and the hub is reduced, and the life of the spring clutch can be extended.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a spring clutch according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing a configuration of a spring clutch according to the present embodiment, and FIG. 2 is an exploded perspective view thereof.

As shown in the drawings, the spring clutch of the present embodiment comprises an input shaft 10, a coil spring 20, a ring member 3
0, two hubs 40 and 40 ', stop collar member 5
0, an output shaft 60, a screw or a pin 70, and the like.

The coil spring 20 has a predetermined inner diameter in a natural state and is wound by a predetermined number of turns, and a shaft is formed from the input side end of the winding part 21 so as to be engageable with the ring member 30. L and a second engaging portion 23 projecting in parallel with the axis L from the output side end of the winding portion 21 so as to be engageable with the first engaging portion 22 and the output shaft 60 in the radial direction. Having. The stainless steel wire (SW) forming the coil spring 20
The cross section such as C) is, for example, a square.

Each of the hubs 40 and 40 'has a substantially cylindrical shape, and has at least one end protruding parallel to the axis L at one end thereof.
One (two in the figure) projections 41 and 41 ′ are provided. The hubs 40 and 40 'are each formed by sintering a powder alloy into a cylindrical shape and impregnating the gaps of the sintered alloy with lubricating oil (sintered oil-impregnated hubs). The outer diameters of the cylindrical portions of the hubs 40 and 40 'are set to be larger than the inner diameter of the winding portion 21 of the coil spring 20 by a predetermined dimension in a natural state. As an example, the outer diameters of the hubs 40 and 40 ′ are 1
If it is set to 5 mm (design reference value), the inner diameter of the winding portion 21 of the coil spring 20 is set to 14.85 mm (design reference value).
Actually, the dimensional tolerance of the part is added to these values.

The input shaft 10 is connected to a gear mechanism (not shown), to which a driving force from a driving source such as a motor is inputted, and a first cylindrical portion 12 to which a hub 40 is fitted around its outer periphery. And the second cylindrical portion 13 into which the ring member 30 is rotatably fitted. As shown in FIG. 1, the input shaft 10 is formed with a concave portion 14 for engaging with the projection 41 of the hub 40, and the hub 40 is fitted into the first cylindrical portion 12 of the input shaft 10. In this state, the two are substantially integrated. An approximately half of the input side of the winding portion 21 of the coil spring 20 is fitted on the cylindrical outer peripheral portion 42 of the hub 40 integrated with the input shaft 10. Hereinafter, for the sake of simplicity, the hub 40 is regarded as a part of the input shaft 10 and is referred to as a first cylindrical portion of the input shaft 10.

The output shaft 60 includes a third cylindrical portion 61 on which the hub 40 ′ is fitted around the outer periphery thereof, and a second cylindrical portion 61 of the coil spring 20.
An engaging groove 62 for engaging with the engaging portion 23, a flange 63 having a predetermined positioning projection 64 and the like formed therein, and a connecting hole having an anti-spin shape cross section connected to a device or mechanism (not shown) 65 (see FIG. 1), for example, is a resin member. As shown in FIG. 2, the output shaft 60 is also formed with a concave portion 66 that engages with the projection 41 ′ of the hub 40 ′, and the hub 40 ′ is fitted on the third cylindrical portion 61 of the output shaft 60. In this state, the two are substantially integrated. The remaining approximately half of the winding part 21 of the coil spring 20 on the output side is fitted to the cylindrical outer peripheral part 42 ′ of the hub 40 ′ integrated with the output shaft 60. Hereinafter, for the sake of simplicity, the hub 40 ′ is regarded as a part of the output shaft 60 and
0 is referred to as a third cylindrical portion.

The ring member 30 is a resin ring which is rotatably fitted to the second tubular portion 13 of the input office 10, and engages with the first engaging portion 22 of the coil spring 20. A through-hole 32 is formed in which the mating groove 31 and the screw or the pin 70 are screwed or press-fitted.

The stop collar member 50 includes a coil spring 2
For example, it is a resin member having a fourth cylindrical portion 52 fitted on the outside of the 0 winding portion 21 and a fifth cylindrical portion 54 fitted on the outer peripheral surface of the ring member 30. The inner diameter of the fourth cylindrical portion 52 is set such that the winding portion 21 of the coil spring 20 is
In a state fitted to the cylindrical portion and the third cylindrical portion of the output shaft 60,
It is larger by a predetermined dimension than the outer diameter of the winding part 21 of the coil spring 20. Further, a stopper 51 is formed at a predetermined position on the outer peripheral surface of the fourth tubular portion 52. In addition, the fifth cylindrical portion 5
On the outer peripheral surface of the elongate hole 4, for example, the relative phase of the stopper 51 to the protrusion 64 of the output shaft 60 can be adjusted.
3 are formed.

Next, the procedure for assembling the spring clutch of the present embodiment will be described. First, the first cylindrical portion 1 of the input shaft 10
Then, the hub 40 is fitted to the hub 2, and then approximately half of the inner side of the winding portion 21 of the coil spring 20 is fitted to the outer peripheral portion 42 of the hub 40. Next, the ring member 30 is fitted from the outside of the winding portion 21 of the coil spring 20, and the second cylindrical portion 13 of the input shaft 10 is fitted.
And the first engagement portion 22 of the coil spring 20.
And the engagement groove 31 provided in the ring member 30. Further, the stop collar member 50 is fitted from outside the winding portion 21 of the coil spring 20 and the coil spring 2
The other half of the winding side 21 on the output side is fitted in the third cylindrical portion 61 of the output shaft 60 while the second engaging portion 23 of the output shaft 60 is engaged with the engaging groove 62 of the output shaft 60. To the outer peripheral portion 42 'of the hub 40'. Next, the phase (or position) of the stopper 51 is adjusted with respect to the positioning protrusion 64 formed on the output shaft 60, and finally, the character or the pin 70 is passed through the elongated hole 53 of the stop collar member 50. Ring member 30
The ring member 30 and the stop collar member 50 are fixed to each other by screwing or press fitting into the through holes 32.

Next, the operation of this embodiment will be described. As described above, the third cylindrical portion of the output shaft 60 (the hub 4
Since the outer diameter of 0 ′) is slightly larger than the inner diameter of the winding portion 21 of the coil spring 20 in the natural state, the coil spring 20 has a substantially half of the winding portion 21 fitted in the third cylindrical portion.
Comes into close contact with the third cylindrical portion due to its restoring force. Further, the second engagement portion 23 of the coil spring 20 is provided with the engagement groove 62 of the output shaft 60.
, The coil spring 20 and the output shaft 60 are substantially integrated.

Similarly, the first cylindrical portion of the input shaft 10 (the hub 4
Since the outer diameter of 0) is slightly larger than the inner diameter of the winding portion 21 of the coil spring 20 in the natural state, approximately half of the winding portion 21 is fitted into the first cylindrical portion and the coil spring 20 is loaded. When the coil spring 20 is not applied, the coil spring 20 comes into close contact with the first cylindrical portion due to its restoring force. Since the input shaft 10 is connected to a drive source via a gear mechanism (not shown) through a gear mechanism 11 and is constantly rotating, the output shaft 60 is integrated with the input shaft 10 when no load is applied to the coil spring 20. It is possible to rotate.

On the other hand, the first engaging portion 22 of the coil spring 20 is engaged with the engaging groove 31 of the ring member 30, and the ring member 30 is fixed to the stop collar member 50 by a pin 70. Therefore, the output shaft 6 (including the hub 40 ')
The coil spring 20, the ring member 30, and the stop collar member 50 are substantially integrated. Here, when the stopper 51 of the stop collar member 50 is locked by a locking lever or the like (not shown), the coil spring 20
Load. Since the input shaft 10 is continuously rotating in a predetermined direction, the coil spring 20 is rotated in a direction in which the coil spring 20 is relatively loosely wound around the first cylindrical portion (hub 40) of the input shaft 10. Therefore, the input shaft 10 can continue to rotate without its rotation being restricted. On the other hand, the output shaft 60
Does not rotate because it is integrally connected to the stop collar member 50 via the coil spring 20 and the ring member 30. That is, by controlling the locking and releasing of the stop collar member 50 using the locking lever and the like, it is possible to control the rotation and stop of the output shaft 60. The lubricating oil impregnated expands due to frictional heat between the winding portion 21 of the coil spring 20 and the surface of the hub 40, and
Lubricate surface 0. As a result, wear of the coil spring 20 and the hub 40 is reduced, and the life of the spring clutch can be extended.

In the assembling procedure of the above embodiment, the flange 63 and the positioning projection 64 are formed on the output shaft 60. Therefore, the output shaft 60 is assembled after the stop collar member 50 is assembled. However, the present invention is not limited to this, and a positioning mark may be provided on the output shaft 60 instead of a flange or a projection. in this case,
Since the stop collar member 50 can be fitted from the outside of the output shaft 60, assembly can be performed in the following procedure.

First, the hub 40 ′ is fitted to the third cylindrical portion 61 of the output shaft 60, and the second engagement portion 2 of the coil spring 20 is
While engaging 3 with the engaging groove 62 provided on the output shaft 60, approximately half of the winding portion 21 on the output side is fitted to the outer peripheral portion 42 of the hub 40 '. Next, from the input side of the coil spring 20,
The hub 40 fitted to the first cylindrical portion 12 of the input shaft 10 is
The remaining part of the winding part 21 is fitted.

Next, the ring member 30 is fitted from the outside of the winding portion 21 of the coil spring 20 to fit the second cylindrical portion 13 of the input shaft 10, and the first engaging portion of the coil spring 20 22 is engaged with an engagement groove 31 provided in the ring member 30. Further, a stop collar member 50 is fitted from outside the winding portion 21 of the coil spring 20, and a stopper 51 is positioned against a positioning plate 64 formed on the output shaft 60.
Adjust the phase (or position) of. Finally, the ring member 3
0 and the stop collar member 50 are fixed by screws or pins 71.

According to this configuration, the stop collar member 5
0 can be incorporated at the end, and assembling becomes easier than the assembling procedure in the above embodiment.

In the above-described embodiment, the gear portion 11 is formed as a portion to which the driving force of the input shaft is input. However, the present invention is not limited to this. Is also good.

Further, in the above embodiment, the ring member 3
0 and the stop collar member 50 are configured to be fixed by screws or pins 70. However, the present invention is not limited to this. For example, as shown in FIG. A ratchet mechanism may be provided. For example, ratchet teeth 55 are formed at a predetermined pitch on the inner peripheral surface of the fifth cylindrical portion 54 of the stop collar member 50, and ratchet claws 33 are formed on the cylindrical outer peripheral portion of the ring member 30. The ring member 30 is formed of a fat molded product, and the ratchet claw 33 is brought into contact with the inner peripheral surface of the fifth cylindrical portion 54 of the stop collar member 50, particularly, the portion of the ratchet teeth 55 due to the elasticity of the resin. With such a configuration, the component shapes of the ring member 30 and the stop collar member 50 are complicated, and although molding accuracy of the components is required, the number of components is reduced as compared with the case of coupling with screws or pins, and It is possible to simplify the assembly process.

[0039]

As described above, according to the spring clutch of the present invention, it is possible to engage a wound portion having a predetermined inner diameter and a predetermined number of turns in a natural state with another member. A first engaging portion projecting from both ends of the winding portion in a predetermined direction;
A coil spring having an engaging portion, a first cylindrical portion fitted with substantially half of the winding portion of the coil spring, and having an outer diameter larger by a predetermined dimension than a predetermined inner diameter of the winding portion; A second cylindrical portion having an outer diameter larger than that of the input portion, the input shaft being connected to the drive source, and being engaged with the first engagement portion of the coil spring;
A ring member rotatably fitted to the tubular portion and a third tubular shape in which the remaining portion of the winding portion of the coil spring is fitted and the outer diameter is larger by a predetermined dimension than the predetermined inner diameter of the winding portion. Part
An output shaft engaged with the second engaging portion of the coil spring, and a wound portion of the coil spring fitted to the first tubular portion and the third tubular portion. Fitted, having an inner diameter larger by a predetermined dimension than the outer diameter of the winding portion,
A stopper formed on an outer peripheral portion, the stopper including a cylindrical stop collar member fixed to a ring member so that a relative phase of the stopper with respect to the output shaft can be adjusted.

That is, in a state where the input shaft is constantly rotated and no load is applied to the coil spring, the output shaft rotates integrally with the input shaft. Also, when the stopper of the stop collar member is locked by a locking lever or the like and a load is applied to the coil spring via the ring member, the coil spring is loosened relative to the first cylindrical portion of the input shaft. The input shaft continues to rotate without its rotation being restricted, and the output shaft is integrally connected to the stop collar member via the coil spring and the ring member, and does not rotate.
That is, it is possible to control the rotation and stop of the output shaft by controlling the locking and releasing of the stop collar member using the locking lever and the like.

In the assembly process of the spring clutch, it is not necessary to adjust the position of the stopper or the like of the stop collar member at the initial stage of the assembly. Assembly becomes very easy. Further, since it is only necessary to rotate the cylindrical stop collar member with respect to its central axis, the adjustment can be made very easy.

Further, by fixing the ring member and the stop collar member with a screw or a pin and making the hole through which the screw or the pin on the stop collar member penetrate into an elongated hole, the position of the adjusted stopper may be shifted. Can be made very low, and the need for readjustment is almost eliminated.

Alternatively, by providing a ratchet mechanism on the opposing surfaces of the ring member and the stop collar member, the shape of the parts becomes complicated, but the joining step using screws or pins can be omitted.

Further, when a sintered oil-impregnated hub is fitted to the first cylindrical portion of the input shaft and the second cylindrical portion of the output shaft, the stop collar member is locked, and when the input shaft idles, a coil spring is used. The friction heat between the oil and the hub surface expands the lubricating oil impregnated to lubricate the hub surface, reducing the wear of the coil spring and the hub, and extending the life of the spring clutch. Become.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment of a spring clutch of the present invention.

FIG. 2 is an exploded perspective view showing the configuration of the embodiment.

FIG. 3 is a view showing a configuration of another embodiment of the spring clutch of the present invention, particularly a ratchet mechanism provided between a ring member and a stop collar member.

FIG. 4 is an exploded perspective view showing a configuration of a conventional spring clutch.

[Explanation of symbols]

 Reference Signs List 10: input shaft 11: gear part 12: first cylindrical part 13: second cylindrical part 20: coil spring 21: winding part 22: first engaging part 23: second engaging part 30: ring member 31 : Engagement groove 32: through hole 40: hub 41: projection 42: outer peripheral portion 40 ′: hub 41 ′: projection 42 ′: outer peripheral portion 50: stop collar member 51: stopper 53: slot 60: output shaft 61: first 3 cylindrical portion 62: engagement groove

Claims (4)

[Claims] 1. A winding portion having a predetermined inner diameter in a natural state and wound by a predetermined number, and a first engagement member projecting from both ends of the winding portion in a predetermined direction so as to be engageable with another member. A coil spring having a mating portion and a second engagement portion, a first half of which is fitted with a substantially half of a winding portion of the coil spring, and an outer diameter of which is larger by a predetermined dimension than the predetermined inner diameter of the winding portion; A second cylindrical portion having an outer diameter larger than that of the first cylindrical portion, the input shaft being connected to a drive source, and being engaged with a first engagement portion of the coil spring; A ring member rotatably fitted to the second cylindrical portion of the input shaft; and a remaining portion of the winding portion of the coil spring fitted therein, and an outer diameter of the predetermined inner diameter of the winding portion. A third cylindrical portion that is larger than the third cylindrical portion by a predetermined dimension, and an output shaft that engages with a second engagement portion of the coil spring; While being fitted to the first tubular portion and the third tubular portion, it is fitted outside the winding portion of the coil spring, has an inner diameter larger by a predetermined dimension than the outer diameter of the winding portion, and has an outer periphery. A spring clutch comprising: a stopper formed in a portion; and a cylindrical stop collar member fixed to the ring member so as to adjust a relative phase of the stopper with respect to the output shaft. 2. The stop member according to claim 1, wherein the ring member and the stop collar member are fixed to each other with a screw or a pin, and the hole through which the screw or the pin passes is formed as an elongated hole. Spring clutch. 3. The spring clutch according to claim 1, wherein a ratchet mechanism is provided on an opposing surface of the ring member and the stop collar member. 4. The sintered oil-impregnated hub is fitted on each of the first cylindrical portion of the input shaft and the second cylindrical portion of the output shaft. Spring clutch.